我正在为我们的员工创建一个在线区域，以便在WordPress中创建新帖子，与学生共享课程资源。我目前正在开发一个部分，学生可以通过该部分将文档上传到自定义帖子（前端表单），然后将这些上传内容存储在上传目录中。

目前，我已经将其上载到目录中，但我无法确定如何根据帖子ID创建新文件夹。

非常感谢您的任何想法。

include_once plugin_dir_path( __FILE__ ).\'upload.php\';

function assignment_uploads(){

  global $post;

  echo \'
    <form method="post" enctype="multipart/form-data" action="">
        <input type="file" name="file_upload">
        <input type="hidden" name="lesson_id" value="\'. $post->ID.\'">
        <input type="submit" name="upload_submitted">
    </form>
  \';
}
add_shortcode( \'student_submission_upload_form\', \'assignment_uploads\' );

// store post id in var
$lesson_id = $_POST[\'lesson_id\']; 

function create_uploads_folder() {
    $upload_dir = $uploadFolder[\'basedir\'];
    $upload_dir = $upload_dir . \'/submissions/\'.$lesson_id;
    if (! is_dir($upload_dir)) {
       mkdir( $upload_dir, 0705 );
    }
}
register_activation_hook( __FILE__, \'create_uploads_folder\' );

// Upload file
if(!move_uploaded_file($_FILES[\'file_upload\'][\'tmp_name\'], $uploadFolder[\'basedir\'] . \'/submissions/\' . $lesson_id . \'/\' . $_FILES[\'file_upload\'][\'name\'])){
    die(\'Error uploading file - check destination is writeable\');
}